Light-excluding device for photographic-plate holders.



' PATENTED NOV. 29, 1904.

' 'F. A. BROWNELL. LIGHT EXGLUDING DEVICE PORPHOTOGRAPHIG PLATE HOLDERS.

APPLICATION FILED SEPT. 14, 1903.

I0 IODEL.

Inventor Attorney.

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No. 776,291. Patented November 29, 1904.

UNITED STATES PATENT OFFICE.

FRANK A. BROVVNELL, OF ROCHESTER, NEW YORK, ASSIGNOR TO EAST- MAN KODAK COMPANY, OF ROCHESTER, NEIV YORK, A CORPORATION OF NEW YORK.

LIGHT-EXCLUDING DEVICE FOR PHOTOGRAPHlC-PLATE HOLDERS.

SPECIFICATION forming part of Letters Patent No. 776,291, dated November 29, 1904.

Application filed September 14, 1903. rial NO- 173.044. (N model.)

To all whom, it may cmwcrn: At one end of the frame thus formed the Be it known that I, FRANK A. BROWNELL, of groove or grooves 3 are continued to the ex- 5 Rochester, in the county of Monroe and State terior of the frame, forming the apertures or of New York, have invented certain new and slots 6 6 of a length and width corresponding 5 useful Improvements in Light-Excluding Deto the dimensions of the exposing-slide, and

vices for Photographic-Plate Holders; and I in the walls of the slots thus formed are prodo hereby declare the following to be afull, vided recesses 7 7 of a length slightly greater clear, and exact description of the same, refthan the length of said slots and having an erence being had to the accompanying drawundercut portion forming an overhanging IO ings, forming a part of this specification, and ledge 8 8. Resting in the recesses thus formed to the reference-numerals marked thereon. are the light-excluding devices 9 9, each com- My present invention relates to improveprising in the present embodiment a comparaments in photographic-plate holders; and it tively stiff base portion or backing 10, havhas for its object to provide improved lighting one edge thereof ofiset to form a flange11 5 excluding devices for the slides and means for and the opposite edge 12 doubled or folded operating them that shall be comparatively upon itself to securely clamp astrip of felt or inexpensive to manufacture and reliable and other suitable material 13 upon one sidethere- 5 eflicient in their action. of, preferably in such manner as to present a To these and other ends my invention confree edge thereof in proximity to one of the 20 sists in certain features of novelty and advanlateral edges of the backing 10. These lighttage to be hereinafter more fully described, excluding devices are preferably of a length and pointed out in the claims hereunto angreater than the width of the slide and are so nexed. placed within the recesses 7 7 that the edge 12 In the drawings, Figure 1 is a perspective thereof will rest beneath the ledge 8 and the 5 View of a double plate-holder with parts reflanged edge 11 will be free to move within said moved, showing my invention applied thererecess about saidedge 12 as an approximate to. Fig. 2 is a transverse sectional view center, pins or projections 14 14:, preferably 7 5 through a plate-holder, showing one of the fixed in the frame and extending through apslides thereof inserted therein. Fig. 3 repertures 15 15 of the device, being provided to 3 resents a section on the line 3 3, Fig. 2; and prevent displacement thereof.

Fig. 4 is a detail view showing the springs I have devised a novel form of spring that and one of thelight-excluding devices removed is particularly applicable to a light-excluding from the holder. device similar to that hereinbefore described,

In the several views similar parts are indithe function of such a spring being to provide 35 cated by the same numerals of reference. an effectual means for exerting a yielding In carrying out my invention any suitable force upon said light-excluding device, norform of plate-holder may be employed, the mally tending to move it out of its recess into 8 5 form shown in the present embodiment prefits slot 6 to completely close the latter autoerably comprising a frame 1 of the desired matically when the exposing-slide is with- 4 dimensions, having a dividing partition or drawn. In the present embodiment of my inseptum 2 and grooves or ways 3 adapted to vention I have shown a pair of such springs receive the exposing-slides, any desired numapplied to a double plate-holder, each comher of which may be employed, recesses 4 5, prising a central portion 16, adapted to rest respectively, being provided at each end of in an aperture 16, and the arms 17 17, ex-

45 the frame thus formed between the slide-retending in opposite directions from said cenceiving ways or grooves and the partition or tral portion. A pair of such springs are prefseptum 2 to receive the ends of the sensitized erably employed in the present instance, the plate in amanner to be hereinafterdescribed. oppositelyarranged arms of which project into the recesses 7 7 and bear against the lightexcluding devices with a pressure tending to move them outwardly. The arms 17 17 of these springs are preferably curved in such a manner that their extremities bear against the light-excluding devices, thereby enabling said arms to be bent freely when said lightexcluding devices are depressed by theins'er tion of the slide, and as the action of the arms bearing against the corresponding light-excluding device at one side of the holder is independent and does not affect the action of the arms at the opposite ends of said spring, due to the relatively fixed central portion thereof, the action thereof upon the light-excluding devices will be uniform irrespective of their relative positions. Springs constructed in this manner may be advantageously used with light-excluding devices of various kinds, it being understood that while I have shown in the present embodiment one particular form of plate-holder to which such springs have been applied I do not so limit myself.

In operating a plate-holder as illustrated in the present embodiment the slide or slides 18 are each slipped into their respective apertures or slots 6 6, the entering edge thereof engaging the inclined surface presented by the light-excluding devices to move them back against the resilient or yielding action of their respective spring-arms 17 17 to open said aperture and admit said slide, the felt or other material 13 bearing against the adjacent side of the slide with a resilient pressure and presenting a pliant or yielding surface that will readily adapt itself to irregularities of the surface with which it abuts. hen the slide is withdrawn, however, its corresponding light-excluding device will be moved outwardly under the action of the spring-arms 17 17 in such a manner that the free or exposed edge of the felt or other material 13 will engage the opposite wall of the slot 6 to effectually close said slot to the entrance of light that would affect the sensitized plate lying within the holder with its edges engaging the recessed portions 4: 5 thereof.

A plate-holder embodying the hereinbeforedescribed features of my invention may be readily and cheaply manufactured and will possess the essential requisites of an eflicient and durable device, and as there are no parts to wear or become disarranged it will be positive and rellable in operation. The springs for operating the light-excluding devices may be cheaply manufactured of any suitable resilient or elastic material and readily inserted Within the holder in such a manner as to facilitate assembling of the parts, and as constructed they will obviously retain themselves in position to eliminate the possibility of displacement, thereby providing means for operating the light-excluding devices that shall be positive and reliable in operation and cflicient and durable in use.

It will of course be understood that while I have illustrated my invention in the present embodiment as applied to a double plateholder 1 do not so limit myself, as it may be employed with plate-holders of various types and forms having either one or more exposing-slides.

I claim as my invention 1. In adcvicc of the character described, the combination with the holder adapted to receive an exposing-slide, and a movable lightexcluding device therein and adapted to be deflected by said slide when inserted in the holder, of a spring having an intermediate portion engaging the holder and the oppositely-extending resilient arms, one of which bears against the light-excluding device to move it toward the slide.

2. In adevice of the character described, the combination with the holder having an aperture therein to receive the exposing-slide, and a light-excluding device mounted in the wall of said aperture, of one or more springs having relatively fixed portions secured in the holder and elastic arms having their extremities extending in a direction transversely of, and bearing against said light-excluding de vice and normally tending to move it outwardly from said wall.

3. In a photographic-plate holder, the combination with the holder having passages therein to receive the exposing-slide and lightexcluding devices movably mounted in recesses formed in the walls of said passages, of a pair of springs each having a relatively fixed central portion secured in position in said holder and oppositely-arranged arms extending in a direction transversely of the line of motion of the slide and exerting a resilient pressure upon said devices tending to move them outwardly from their recesses.

4:. In a photographic-plate holder, a spring for operating the light-excluding devices for the slide, having a relatively fixed central portion, and resilient arms extending laterally in opposite directions therefrom and having extremities adapted to bear upon said devices.

5. In a photographic-plate holder, a spring for operating-the light-excluding devices having a relatively lixed central portion supported by the holder and a pair of curved arms disposed in relatively opposite directions and at an angle to said central portion, the extremities of which are adapted to exert a resilient pressure upon said devices.

6. In a photographie-plate holder, a spring for operating the light-excluding devices having a central portion and a pair of curved arms bent at an angle to said central portion and extending substantially parallel and in 0 pposite directions in relation to each other.

7. In a photographic-plate holder, a light- IIO excluding device, comprising a backing of stiff material having an edge thereof doubled or folded over to engage and retain a facingstrip of felt or similar material, the opposite edge of the facing-strip being free and adapted to present a yielding surface.

8. A photographic plate holder having Ways to receive the exposing-slides and apertures through which said slides pass, lightexcluding devices pivotally mounted in recesses formed in the Walls of said apertures, an overhanging portion engaging an edge of each of said devices causing the latterto move aboutsaid portion as a pivot, projections entering apertures therein to retain said devices in position, and springs each having a relatively fixed portion thereof extending through said holder and having resilient arms extending into said recesses and bearing against said devices normally tending to move them out- Wardly therefrom.

9. A photographic plate holder having Ways to receive a pair of exposing-slides, and apertures through Which said slides pass, a pair of recesses being formed in the Walls of said apertures at opposite sides of the holder and separated by an apertured partition, of

light-excluding devices movably mounted in said recesses, and one or more springs each having a portion thereof extending through the aperture of said partition, and having a pair of oppositely-arranged arms lying upon opposite sides thereof and bearing against said light-excluding devices.

10. A photographic-plate holder, having Ways to receive the exposing-slides, and apertures through Which said slides pass, recesses being formed in the Walls of said apertures upon opposite sides of the holder and an ap ertured partition separating said recesses, of a light-excluding device movably mounted in each recess, and a pair of springs each having a portion thereof extending through the aperture of said partition and. provided With a pair of resilient arms extending in opposite directions upon opposite sides of said partition, the extremities of the arms of each spring bearing against the light-excluding devices at opposite sides of the partition.

FRANK A. BROWNELL.

WVitnesses:

Gr. VVILLARD R1011, CLARENCE A. BATEMAN. 

